https://gist.github.com/quietlynn/0492ac8e71089709d1d3 的作业解答

js01.md.js

//作业1：摄氏度转换为华氏度
var c = 39;
var f = 9/5 * c + 32;
console.log(c + "摄氏度等于" + f +"华氏度");

//作业2：交换两个变量的值
var alice = 8;
var bob = 5;
//如果我取巧直接console.log("交换后: " + bob + " , " + alice)，静琴会拍死我吧
//除了直观的使用中间变量temp以外，XOR最有趣了，就用这个了。JS也是用^来算的啊
console.log("交换前: alice, bob分别有" + alice + ", " + bob + "个苹果");
alice = alice ^ bob;
bob = bob ^ alice;
alice = alice ^ bob;
console.log("交换后: alice, bob分别有" + alice + ", " + bob + "个苹果");

//作业3：JS作为计算器
//那就计算某年某月某日距今多久吧，自然不作死算太久远的日期了
var thatDate = new Date("6/4/1989");

//现在的日期是啥？
var thisDate = new Date();

//中间经过了多少毫秒呢？
var interval = thisDate.getTime() - thatDate.getTime();

//日，时，分，秒，开算。应该不怎么精确吧，时刻点的准确值、时区我都不知道
var days = Math.floor(interval / 86400000);
interval = interval - (days * 86400000);

var hours = Math.floor(interval / 3600000);
interval = interval - (hours * 3600000);

var minutes = Math.floor(interval / 60000);
interval = interval - (minutes * 60000);

var seconds = Math.floor(interval / 1000 );

console.log("已经过去了：" + days + "天" + hours + "时" + minutes + "分" + seconds + "秒");


//node.js v0.10.26 测试通过 by TsingYe @2014-6-1
//BTW, 儿童节快乐！